*{
    margin: 0;
    padding: 0;
}
ul li{
    list-style: none;
}
*{
    color: greenyellow;
}
body{
    font-size: 0;
    text-align: center;
    height: 1000px;
}
.box{
    display: inline-block;
    width: 250px;
    height: 250px;
    background-color: greenyellow;
    margin: 10px 10px;
    border: 25px solid burlywood;
    padding: 25px;
    >div{
        width: 0;
        height: 0;
        border: 125px solid transparent;
        border-left-color: red;
    }
}
.right{
    >div{
        border: 125px solid transparent;
        border-right-color: red;
    }
}
.nose{
    width: 200px;
    height: 100px;
    background-color: sandybrown;
    margin: 0 auto;
    // margin-bottom: 40px;
}
.mouth{
    transition: 1s;
    box-sizing: border-box;
    width: 500px;
    height: 250px;
    background-color: tomato;
    padding: 20px;
    margin: 0 auto;
    margin-top: 50px;
    >div{
        width: 100%;
        height: 100%;
        background-color: violet;
        >div{
            margin: 0 auto;
            width: 0;
            height: 0;
        }
    }
    &:hover{
        width: 550px;
        height: 300px;
    }
}